Tumble system for the intake manifold of an internal-combustion engine provided with an actuator made with shape-memory material
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02B-031/04
F02B-031/06
출원번호
UP-0432726
(2006-05-11)
등록번호
US-7823558
(2010-11-22)
우선권정보
EP-05425310(2005-05-11)
발명자
/ 주소
Bellato, Nazario
Lancioni, Federico
Pecora, Michele
출원인 / 주소
Magneti Marelli Powertrain S.p.A.
대리인 / 주소
Santarelli, Bryan A.
인용정보
피인용 횟수 :
1인용 특허 :
12
초록▼
A tumble system for the intake manifold of an internal-combustion engine is provided with a number of cylinders. The tumble system is provided with at least one throttle valve for varying the section of passage of air through an intake pipe, which connects a cylinder with the intake manifold. The th
A tumble system for the intake manifold of an internal-combustion engine is provided with a number of cylinders. The tumble system is provided with at least one throttle valve for varying the section of passage of air through an intake pipe, which connects a cylinder with the intake manifold. The throttle valve has a throttle butterfly mounted so as to rotate under the thrust of an actuator device equipped with at least one actuator element, which is made of a shape-memory material that generates a torque by modifying its own geometry following upon application of an external stress of a physical nature.
대표청구항▼
The invention claimed is: 1. A tumble system for an intake manifold of an internal-combustion engine provided with a number of cylinders; the tumble system comprising: at least one throttle valve for varying the section of passage of the air through an intake pipe, which connects at least one cylin
The invention claimed is: 1. A tumble system for an intake manifold of an internal-combustion engine provided with a number of cylinders; the tumble system comprising: at least one throttle valve for varying the section of passage of the air through an intake pipe, which connects at least one cylinder with the intake manifold, and at least one actuator device for governing the throttle valve; wherein the actuator device comprises: at least one first actuator element, which is filiform, is wound in a spiral so as to assume the conformation of a spring, and is made of a shape-memory material that generates a displacement of activation of the throttle valve by modifying its own geometry following upon application of an external stress of a physical nature; at least one second actuator element, which is filiform, is wound in a spiral so as to assume the conformation of a spring, and is made of a shape-memory material that generates a displacement of activation of the throttle valve by modifying its own geometry following upon application of an external stress of a physical nature; and electric activating means for applying an external stress of a physical nature to the actuator elements; wherein the actuator elements are sized in such a way that, in the absence of external energizing, an actuator element prevails over the other actuator element. 2. The tumble system according to claim 1, in which each actuator element is wound in a spiral so as to assume the conformation of a compression spring. 3. The tumble system according to claim 1, in which each actuator element is wound in a spiral so as to assume the conformation of a extension spring. 4. The tumble system according to claim 1, in which each actuator element is wound in a spiral so as to assume the conformation of a one-way spring. 5. The tumble system according to claim 1, in which each actuator element is wound in a spiral so as to assume the conformation of a two-way spring. 6. The tumble system according to claim 1, in which each actuator element modifies its own geometry following upon application of heat. 7. The tumble system according to claim 6, in which each actuator element is heated by the Joule effect, causing circulation of an electric current through the actuator element itself. 8. The tumble system according to claim 6, in which: the actuator device comprises heating means for heating the actuator elements and cooling means for cooling the actuator elements; and the actuator device is designed to heat the first actuator element and simultaneously cool the second actuator element, and vice versa. 9. The tumble system according to claim 8, in which the heating means are designed to cause heating of an actuator element via application of a voltage between the ends of the actuator element in such a way as to bring about passage of an electric current through the actuator element and heat the actuator element itself by the Joule effect. 10. The tumble system according to claim 8, in which the cooling means comprise a Peltier cell. 11. The tumble system according to claim 1, in which: the actuator device comprises a shaft mounted so as to slide axially, a central disk fixed to the shaft, and two end disks, which are arranged on opposite sides of the central disk, are mounted in a fixed position and have respective central holes through which the shaft slides freely; set between a first end disk and the central disk is a number of actuator elements symmetrically distributed around the shaft; and set between a second end disk and the central disk is a number of actuator elements symmetrically distributed around the shaft. 12. The tumble system according to claim 11, in which the two end disks constitute the two opposite bases of a cylindrical body, which is hollow so as to house inside it the central disk and part of the shaft. 13. The tumble system according to claim 12, in which the side surface and/or the end disks of the cylindrical body are thermally insulated. 14. The tumble system according to claim 11, in which the actuator device comprises a cooling means, which are designed to cause a forced cooling of the actuator elements and is integrated in the central disk. 15. The tumble system according to claim 14, in which the cooling means comprise at least one Peltier cell inserted into the central disk. 16. The tumble system according to claim 14, in which the cooling means comprise at least one Peltier cell, which defines the central disk. 17. The tumble system according to claim 1, in which: the actuator device comprises a fixed frame, and a disk, which is mounted so that it can turn on the fixed frame so as to rotate about an axis of rotation and is mechanically connected to the throttle valve; rising from the disk are two pins, which are set parallel to the axis of rotation, are arranged eccentrically with respect to the axis of rotation, and are set symmetrically on opposite sides of the axis of rotation itself; a first end of the first actuator element is mechanically connected to a first pin, and a second end of the first actuator element is mechanically connected to the fixed frame; and a first end of the second actuator element is mechanically connected to a second pin, and a second end of the second actuator element is mechanically connected to the fixed frame. 18. The tumble system according to claim 1, in which the throttle valve comprises a throttle butterfly mounted on a shaft so as to rotate under the thrust of the actuator device about an axis of rotation; the first actuator element generates a torque by modifying its own geometry following upon application of an external stress of a physical nature on the first actuator element itself. 19. The tumble system according to claim 18, in which the first actuator element generates a torque by modifying its own geometry following upon application of heat on the first actuator element itself. 20. The tumble system according to claim 19, in which the first actuator element is heated by the Joule effect, causing the first actuator element itself to be traversed by an electric current. 21. The tumble system according to claim 19, in which: the first actuator element is designed to generate a torque for displacing the throttle butterfly from a resting position to a position of maximum extraction; and the actuator device comprises at least one second actuator element designed to generate a torque for displacing the throttle butterfly from the position of maximum extraction to the resting position. 22. The tumble system according to claim 21, in which the two actuator elements are sized in such a way that, in the absence of energizing, the second actuator element exerts a torque greater than that exerted by the first actuator element, and the throttle butterfly is thus set in the resting position. 23. The tumble system according to claim 21, in which the second actuator element is made of a shape-memory material and generates a displacement by modifying its own geometry following upon application of heat on the second actuator element itself. 24. The tumble system according to claim 23, in which each actuator element is filiform and is wound in a spiral so as to assume the conformation of a spring. 25. The tumble system according to claim 23, in which: the actuator device comprises a fixed frame and a disk, which is mounted so that it can turn on the fixed frame and is mechanically connected to the shaft of the throttle butterfly; rising from the disk are two pins, which are set parallel to the axis of rotation, are arranged eccentrically with respect to the axis of rotation, and are set symmetrically on opposite sides of the axis of rotation itself; a first end of the first actuator element is mechanically connected to a first pin, and a second end of the first actuator element is mechanically connected to the fixed frame; and a first end of the second actuator element is mechanically connected to a second pin, and a second end of the second actuator element is mechanically connected to the fixed frame. 26. The tumble system according to claim 23, in which the actuator device comprises a pair of energizing devices, each of which is designed to cause heating of a respective actuator element via application of a voltage between the ends of the actuator element in such a way as to cause passage of an electric current through the actuator element and heat the actuator element itself by the Joule effect. 27. The tumble system according to claim 23, in which the actuator device comprises at least one first cooling member, which is designed to cause a forced cooling of the first actuator element. 28. The tumble system according to claim 27, in which the cooling member comprises at least one Peltier cell mounted on the first actuator element. 29. The tumble system according to claim 23, in which the actuator device comprises a second cooling member, which is designed to cause a forced cooling of the second actuator element. 30. The tumble system according to claim 1, in which: the throttle valve comprises a throttle butterfly mounted on a shaft so as to rotate under the thrust of the actuator device about an axis of rotation; and the axis of rotation of the throttle butterfly is set substantially on the outside with respect to the intake pipe in such a way that, in a resting position, the throttle butterfly does not bring about any reduction in the section of passage of the air of the intake pipe. 31. The tumble system according to claim 30, in which: the intake pipe has a wall delimiting the section of passage of the air; and the throttle butterfly is mounted on a respective shaft embedded in the wall of the respective intake pipe. 32. The tumble system according to claim 31, in which the wall of the intake pipe has a seat, which is designed to house the throttle butterfly when the throttle butterfly itself is set in a resting position. 33. A tumble system for an intake manifold of an internal-combustion engine provided with a number of cylinders; the tumble system comprising: at least one throttle valve for varying the section of passage of the air through an intake pipe, which connects at least one cylinder with the intake manifold, and at least one actuator device for governing the throttle valve; wherein the actuator device comprises: at least one first actuator element, which is filiform, is wound in a spiral so as to assume the conformation of a spring, and is made of a shape-memory material that generates a displacement of activation of the throttle valve by modifying its own geometry following upon application of an external stress of a physical nature; at least one second actuator element, which is filiform, is wound in a spiral so as to assume the conformation of a spring, and is made of a shape-memory material that generates a displacement of de-activation of the throttle valve by modifying its own geometry following upon application of an external stress of a physical nature; and electric activating means for applying an external stress of a physical nature to the actuator elements; wherein each actuator element modifies its own geometry following upon application of heat and the actuator device comprises heating means for heating the actuator elements and cooling means for cooling the actuator elements; and wherein the actuator device is designed to heat the first actuator element and simultaneously cool the second actuator element, and vice versa. 34. The tumble system according to claim 33, wherein the heating means are designed to cause heating of an actuator element via application of a voltage between the ends of the actuator element in such a way as to bring about passage of an electric current through the actuator element and heat the actuator element itself by the Joule effect. 35. The tumble system according to claim 33, wherein the cooling means comprise a Peltier cell. 36. A tumble system for an intake manifold of an internal-combustion engine provided with a number of cylinders; the tumble system comprising: at least one throttle valve for varying the section of passage of the air through an intake pipe, which connects at least one cylinder with the intake manifold, and at least one actuator device for governing the throttle valve; wherein the actuator device comprises: at least one first actuator element, which is filiform, is wound in a spiral so as to assume the conformation of a spring, and is made of a shape-memory material that generates a displacement of activation of the throttle valve by modifying its own geometry following upon application of an external stress of a physical nature; at least one second actuator element, which is filiform, is wound in a spiral so as to assume the conformation of a spring, and is made of a shape-memory material that generates a displacement of de-activation of the throttle valve by modifying its own geometry following upon application of an external stress of a physical nature; and electric activating means for applying an external stress of a physical nature to the actuator elements; wherein the actuator device comprises a fixed frame, and a disk, which is mounted so that it can turn on the fixed frame so as to rotate about an axis of rotation and is mechanically connected to the throttle valve; wherein rising from the disk are two pins, which are set parallel to the axis of rotation, are arranged eccentrically with respect to the axis of rotation, and are set symmetrically on opposite sides of the axis of rotation itself; wherein a first end of the first actuator element is mechanically connected to a first pin, and a second end of the first actuator element is mechanically connected to the fixed frame; and wherein a first end of the second actuator element is mechanically connected to a second pin, and a second end of the second actuator element is mechanically connected to the fixed frame. 37. A tumble system for an intake manifold of an internal-combustion engine provided with a number of cylinders; the tumble system comprising: at least one throttle valve for varying the section of passage of the air through an intake pipe, which connects at least one cylinder with the intake manifold, and at least one actuator device for governing the throttle valve; wherein the actuator device comprises: at least one first actuator element, which is filiform, is wound in a spiral so as to assume the conformation of a spring, and is made of a shape-memory material that generates a displacement of activation of the throttle valve by modifying its own geometry following upon application of an external stress of a physical nature; at least one second actuator element, which is filiform, is wound in a spiral so as to assume the conformation of a spring, and is made of a shape-memory material that generates a displacement of de-activation of the throttle valve by modifying its own geometry following upon application of an external stress of a physical nature; and electric activating means for applying an external stress of a physical nature to the actuator elements; wherein the throttle valve comprises a throttle butterfly mounted on a shaft so as to rotate under the thrust of the actuator device about an axis of rotation; the first actuator element generates a torque by modifying its own geometry following upon application of an external stress of a physical nature on the first actuator element itself; wherein the first actuator element generates a torque by modifying its own geometry following upon application of heat on the first actuator element itself; wherein the first actuator element is designed to generate a torque for displacing the throttle butterfly from a resting position to a position of maximum extraction; and the actuator device comprises at least one second actuator element designed to generate a torque for displacing the throttle butterfly from the position of maximum extraction to the resting position; and wherein the two actuator elements are sized in such a way that, in the absence of energizing, the second actuator element exerts a torque greater than that exerted by the first actuator element, and the throttle butterfly is thus set in the resting position. 38. The tumble system according to claim 37, wherein the second actuator element is made of a shape-memory material and generates a displacement by modifying its own geometry following upon application of heat on the second actuator element itself. 39. The tumble system according to claim 38, wherein each actuator element is filiform and is wound in a spiral so as to assume the conformation of a spring. 40. The tumble system according to claim 38, wherein: the actuator device comprises a fixed frame and a disk, which is mounted so that it can turn on the fixed frame and is mechanically connected to the shaft of the throttle butterfly; rising from the disk are two pins, which are set parallel to the axis of rotation, are arranged eccentrically with respect to the axis of rotation, and are set symmetrically on opposite sides of the axis of rotation itself; a first end of the first actuator element is mechanically connected to a first pin, and a second end of the first actuator element is mechanically connected to the fixed frame; and a first end of the second actuator element is mechanically connected to a second pin, and a second end of the second actuator element is mechanically connected to the fixed frame. 41. The tumble system according to claim 38, wherein the actuator device comprises a pair of energizing devices, each of which is designed to cause heating of a respective actuator element via application of a voltage between the ends of the actuator element in such a way as to cause passage of an electric current through the actuator element and heat the actuator element itself by the Joule effect. 42. The tumble system according to claim 38, wherein the actuator device comprises at least one first cooling member, which is designed to cause a forced cooling of the first actuator element. 43. The tumble system according to claim 42, wherein the cooling member comprises at least one Peltier cell mounted on the first actuator element. 44. The tumble system according to claim 38 wherein the actuator device comprises a second cooling member, which is designed to cause a forced cooling of the second actuator element.
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이 특허에 인용된 특허 (12)
Kroll John W. (Greendale WI) Baran Michael S. (Wauwatosa WI) Mading James E. (Sussex WI), Bistable SME actuator with retainer.
Moschini,Renzo; Bellato,Nazario; Lancioni,Federico; Nazzaro,Riccardo; Sirani,Sandro, Choke valve provided with an integrated electromagnetic actuator for an intake manifold with a retracting tumble system.
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